Method of preventing schileren formation in a glass melt...

Details Method of preventing schileren formation in a glass melt... Method of preventing schileren formation in a glass melt...

2006-02-21

2006-02-21

Walls, Dionne A. (Department: 1731)

Glass manufacturing

Processes

Forming product or preform from molten glass

C065S135200, C065S135300

Reexamination Certificate

active

07000431

ABSTRACT:
The sleeve-type glass melt agitator has a rotatable cylindrical sleeve provided with outwardly protruding vane elements and through-going openings in its outer cylindrical surface to stir the glass melt when the sleeve is rotated. The sleeve type agitator is arranged vertically in a glass melt feed channel in a glass melt feed system for making glass tubes or pipes according to the Vello or down-drawn process. During formation of glass tubes or pipes from the glass melt the sleeve-type agitator is rotated as the glass melt flows downward to prevent formation of schlieren in the glass melt, which causes glass material losses.

REFERENCES:
patent: 2093374 (1937-09-01), Wadsworth
patent: 568 955 (1933-01-01), None

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